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//! The `BinaryAddHiInstance` module defines an specific instance to perform witness computations
//! for the packed add operations proven by the Binary Add Hi State Machine.
//!
//! It manages collected inputs and interacts with the `BinaryAddHiSM` to compute witnesses for
//! execution plans.
use crate::{BinaryAddHiCollector, BinaryAddHiSM, ChunkCollect, ADD_KINDS};
use pil2_std_lib::Std;
use proofman_common::{AirInstance, ProofCtx, ProofmanResult, SetupCtx};
use proofman_fields::PrimeField64;
use std::{collections::HashMap, sync::Arc};
use zisk_common::StatsType;
use zisk_common::{
BusDevice, CheckPoint, ChunkId, Instance, InstanceCtx, InstanceType, PayloadType,
};
use zisk_pil::{BinaryAddHiTrace, BinaryAddHiTraceRow, BinaryAddHiTraceRowPacked};
/// The `BinaryAddHiInstance` struct represents an instance for packed add witness computations.
///
/// It encapsulates the `BinaryAddHiSM` and its associated context, and it processes input data
/// to compute witnesses for the additions whose result fits in the low 32-bit limb.
pub struct BinaryAddHiInstance<F: PrimeField64> {
/// Binary Add Hi state machine.
binary_add_hi_sm: Arc<BinaryAddHiSM<F>>,
/// What this instance takes from each chunk: a `(count, skip)` per kind of operation, plus the
/// frequent operations it accounts for. The counts are in operations, not rows, since one row
/// holds ADDS_X_ROW of them.
collect_info: HashMap<ChunkId, ChunkCollect<ADD_KINDS>>,
/// Instance context.
ictx: InstanceCtx,
/// Standard library instance, providing common functionalities.
std: Arc<Std<F>>,
}
impl<F: PrimeField64> BinaryAddHiInstance<F> {
/// Creates a new `BinaryAddHiInstance`.
///
/// # Arguments
/// * `binary_add_hi_sm` - An `Arc`-wrapped reference to the Binary Add Hi State Machine.
/// * `ictx` - The `InstanceCtx` associated with this instance, containing the execution plan.
///
/// # Returns
/// A new `BinaryAddHiInstance` initialized with the provided state machine and context.
pub fn new(
binary_add_hi_sm: Arc<BinaryAddHiSM<F>>,
mut ictx: InstanceCtx,
std: Arc<Std<F>>,
) -> Self {
assert_eq!(
ictx.plan.air_id,
BinaryAddHiTrace::<()>::AIR_ID,
"BinaryAddHiInstance: Unsupported air_id: {:?}",
ictx.plan.air_id
);
let meta = ictx.plan.meta.take().expect("Expected metadata in ictx.plan.meta");
let collect_info = *meta
.downcast::<HashMap<ChunkId, ChunkCollect<ADD_KINDS>>>()
.expect("Failed to downcast ictx.plan.meta to expected type");
Self { binary_add_hi_sm, collect_info, ictx, std }
}
pub fn build_binary_add_hi_collector(&self, chunk_id: ChunkId) -> BinaryAddHiCollector<F> {
BinaryAddHiCollector::new(self.collect_info[&chunk_id], self.std.clone())
}
}
impl<F: PrimeField64> Instance<F> for BinaryAddHiInstance<F> {
/// Computes the witness for the packed add execution plan.
///
/// This method leverages the `BinaryAddHiSM` to generate an `AirInstance` using the collected
/// inputs.
///
/// # Arguments
/// * `_pctx` - The proof context, unused in this implementation.
/// * `_sctx` - The setup context, unused in this implementation.
/// * `collectors` - A vector of input collectors to process and collect data for witness
///
/// # Returns
/// An `Option` containing the computed `AirInstance`.
fn compute_witness(
&self,
_pctx: &ProofCtx<F>,
_sctx: &SetupCtx<F>,
collectors: Vec<(usize, Box<dyn BusDevice<PayloadType>>)>,
trace_buffer: Vec<F>,
packed: bool,
) -> ProofmanResult<Option<AirInstance<F>>> {
let inputs: Vec<_> = collectors
.into_iter()
.map(|(_, collector)| {
let collector = collector.as_any().downcast::<BinaryAddHiCollector<F>>().unwrap();
collector.inputs
})
.collect();
if packed {
Ok(Some(
self.binary_add_hi_sm
.compute_witness::<BinaryAddHiTraceRowPacked<F>>(&inputs, trace_buffer)?,
))
} else {
Ok(Some(
self.binary_add_hi_sm
.compute_witness::<BinaryAddHiTraceRow<F>>(&inputs, trace_buffer)?,
))
}
}
/// Retrieves the checkpoint associated with this instance.
///
/// # Returns
/// A `CheckPoint` object representing the checkpoint of the execution plan.
fn check_point(&self) -> &CheckPoint {
&self.ictx.plan.check_point
}
/// Retrieves the type of this instance.
///
/// # Returns
/// An `InstanceType` representing the type of this instance (`InstanceType::Instance`).
fn instance_type(&self) -> InstanceType {
InstanceType::Instance
}
fn stats_type(&self) -> StatsType {
StatsType::Opcodes
}
/// Builds an input collector for the instance.
///
/// # Arguments
/// * `chunk_id` - The chunk ID associated with the input collector.
///
/// # Returns
/// An `Option` containing the input collector for the instance.
fn build_inputs_collector(&self, chunk_id: ChunkId) -> Option<Box<dyn BusDevice<PayloadType>>> {
Some(Box::new(BinaryAddHiCollector::new(self.collect_info[&chunk_id], self.std.clone())))
}
fn as_any(&self) -> &dyn std::any::Any {
self
}
}